We have an app that has RadComboBox controls arranged above some RadNumericUpDown controls. For the RadNumericUpDown controls we have it set up to open a numeric pad on PreviewMouseUp to support both mouse and touch. The issue we have is that when a combobox item is selected that lies over a numericupdown using touch, the numericupdown control receives the focus and activates the numeric pad. This does not occur when using a mouse.

Attached is an example derived from our app that reproduces this behavior. Selecting Pounds or Newtons from the Force combobox using touch will cause a message box to appear.

Is there any way to work around this behavior? It is annoying but not a show-stopper.

Thanks,
Jim

I just found a 15 year old post about RadComboBox filtering and virtualization not working

I cant understand why this hasn't been fixed yet ? 

GridView supports filtering and virtualization, so it's not like you dont know how to fix it.

You ESPECIALLY need virtualization AND filtering when you have 1000+ elements in your ComboBox like i do, 

we have a list of 3000 companies that i want to use in a selector...

it's only after completly abandonding RadComboBox and using the RadAutocompleterBox that i was able to achieve what i wanted - kind of. 

Could you PLEASE prioritize this missing feature ?

I've been pulling my hair out on this forever.  I'm developing an application that has items with custom fields.  Sometimes the user will choose an option from the custom field, sometimes they'll leave it blank.  I'm trying to get a RadComboBox to display the selected item only if the item is not null.  If the item is null, then the combobox should display nothing (or a notice it's blank).  

   What's happening is either the combobox does not keep in sync, or it defaults to the first item in the collection.  I need it to be in sync, but not default to the first item in the list if the property is null.  For example simplified view of my ViewModel:

Class CustomField:  Id as Integer, Description as String

ViewModel:

  Public Property Selection as CustomField
  Public Options as ObservableCollection(Of CustomField)

WPF:

        <telerik:RadComboBox x:Name="rcbDropDown" 
                             ItemsSource="{Binding Path=Options}"
                             SelectedValuePath="Id"
                             DisplayMemberPath="Choice"
                             SelectedItem="{Binding Path=Selection, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                             ClearSelectionButtonContent="Clear"
                             ClearSelectionButtonVisibility="Visible"
                             IsEditable="False"
                             IsReadOnly="{Binding Path=IsReadOnly}"
                             EmptyText="Not Set"
                             UpdateSelectionOnLostFocus="True"
                             />

I've tried multiple combinations of SelectedItem Mode=TwoWay, OneWayToSource and IsSyncronizedWithCurrentItem=True/False/NULL

   I either end up with them syncing and the combo box defaulting to the first item on the list automatically, and pushing that into the viewmodel when the record is viewed, or not syncing.  I can't get it to only show the selected item when it's not null.  Any help would be appreciated!

I have a quite strange behavior for ComboBox

When I set IsReadOnly to true the ReadOnlyBorderBrush of the theme is apllied but ReadOnlyBackBrush is not, also it is not really read only value can still be changed by the user. To avoid this I have set IsReadOnly to true and IsEnabled to false in that case neither Border nor BackBrush is applied.

What am I missing here?

Here is a example 1st Combox has IsReadOnly="True" IsEnabled="False", 2nd Combox only IsReadOnly="True" and at the bottom a TextBox with only IsReadOnly="True" as reference.

I've been working with the Telerik WPF controls for the last couple of months and appreciating them.

<rant>

However, I have a major gripe as well:  most of the examples are FAR too complex.  Here's a perfect example.  I'm trying to get a ComboBox to work with a GridView.  There is an example that does pretty much exactly what I want at https://github.com/telerik/xaml-sdk/tree/master/ComboBox/DropDownWithHeaders.  However,

1. A simple clone from the repository won't run.  That seems fundamental to me.  When I look into it, the problem is themes.  A simple example should not even include themes!  I would suggest a proper example would allow me to clone and run, with nothing else on my machine but Visual Studio.
2. When I look into the actual example, it is anything but simple!  The control template is 155 lines of code!?!?!  How do I sort through that quickly and figure out what I need and don't need?  I don't need all kinds of animation or fancy styles.  For the purposes of learning the controls, I need the absolute minimum to make it work!

There is also an example of this at https://www.telerik.com/forums/radcombobox-with-radgridview, but it suffers from the same problems.

This kind of thing seriously makes me ponder going back to our old controls provider.

</rant>

Now, can someone please provide me with a simple example of a ComboBox that uses a GridView for the drop-down?

Of course perhaps I'm using the wrong control.  Maybe I should be using the MultiColumnComboBox, but the end results shown in the examples make it look nothing like a traditional ComboBox.  (Again, that may be owing to a lack of a good, simple example.)

Help?

We were using a standard Window object as the parent for our MainWindow. All was good. Then we wanted to do theming...couldn't do it easily, we found we needed to change to telerik:RadWindow. That's when everything went.....bad. No more window icons, no more task bar icon, no more showing up in taskbar. We've been able to figure out msot things and add more code to "fix" what we thought should be part of the default behaviour.

Then this morning my boss uses the mouse to try to change a value in a RadComboBox.....nope. Huh? I must have done something wrong? I don't think so. The change is in git and linked to the exact date we changed from Window to RadWindow..

How are you supposed to get mouse selections to work with a RadComboBox contained in a RadWindow?

Hi,

I would like to have the DataFormComboBoxField  behave the same way as the Edit mode: Editable, Read-Only and Auto Complete ad in your demo application. But when I set it to readonly it is disabled.

My code:

e.DataField = new DataFormComboBoxField()
{
    ItemsSource = _componentsDS.ComponentKeyWords,
    SelectedValuePath = "KeyWordId",
    DisplayMemberPath = "Abbreviation",
    DataMemberBinding = new Binding("KeywordId") { Mode = BindingMode.TwoWay },
    IsComboboxEditable = true,
    IsReadOnly = true,
    Label = "Keyword"
};

The example in your application:

Kind regards,

Johan

i have a combo box that i need when i select one of it's items, it will open a new sub combo box to choose a sub item

is it feasible?

We have a issue with WPF RadComboBox to disable the auto selection of first item while databinding.

I have large set of data (say 10000 items) in the application cache.

<telerik:RadComboBox
                                        x:Name="itemBox"
                                        HorizontalAlignment="Stretch"
                                        telerik:TextSearch.TextPath="Name"
                                        CanAutocompleteSelectItems="False"
                                        DisplayMemberPath="Name"
                                        EmptyText="Select item"
                                        IsEditable="True"
                                        IsFilteringEnabled="True"
                                        IsReadOnly="False"
                                        IsTextSearchEnabled="True"
                                        ItemsSource="{Binding ItemCollection, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                                        OpenDropDownOnFocus="True"
                                        ScrollViewer.VerticalScrollBarVisibility="Auto"
                                        SelectedItem="{Binding SelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                                        TextSearchMode="Contains">

                                                <telerik:EventBinding
                                                Command="{Binding BeginSearchCommand}"
                                                EventName="KeyUp"
                                                PassEventArgsToCommand="True" />
</telerik:RadComboBox>

We have the RadCombobox with Filter enabled.

BeginSearchCommand relay command method has implementation of filtering the cached ItemCollection and setting the value.

this.ItemCollection = new QueryableCollectionView(new ObservableCollection<ItemModel>(filtereditems));

I first load 50 items in RadCombobox and the user will try to search the items from SearchText . Then the items in the cache is filtered with searchtext and the result is assigned with the datasource property.

1. User start searching
2. The first item from the filtered result occupies the search text.

The couple of action above continues. Please help us disable autoselect  while databinding.